AZ61镁合金滑动摩擦磨损性能  

Dry Sliding Wear Property of AZ61 Magnesium Alloy

作　　者：郭成伟[1] 徐晓东[1] 周芳芳[2] 王清河[1] 王文龙[1] 张天旭[1] 崔喜贺[1] 鲍宇飞 

机构地区：[1]承德石油高等专科学校工业技术中心,河北承德067000 [2]承德石油高等专科学校石油工程系,河北承德067000

出　　处：《承德石油高等专科学校学报》2017年第5期35-39,共5页Journal of Chengde Petroleum College

摘　　要：研究铸态AZ61镁合金在销-盘接触模式下的干磨损行为,测量AZ61镁合金在0.1~2.0 m/s滑动速率下加载20~360 N时摩擦系数和磨损率的变化,结果表明:合金磨损机制包含了微观切削、氧化磨损、磨粒磨损、剥层磨损、热软化磨损和融化磨损。加载载荷较小时,滑动速率增加减少磨损面之间微接触点作用时间,造成材料应变滞后,合金磨损率逐渐减小,摩擦系数减小。增加载荷,滑动速率增加,剥层磨损出现并主导磨损率的增加。其后热软化磨损和融化磨损导致磨损表面材料转移更加严重,磨损率出现急剧增加。热软化时发生化合物融化导致磨损率增加不连贯性。Wear behavior of AZ61 casting alloy under dry sliding conditions using a pin-on-disc configuration within a load range of 20 -360 N and at sliding speeds of 0.1 m/s, 0.5 m/s, 1.0 m/s and 2.0 m/s, separately, had been researched. The wear rate and coefficient of all velocities had been measured at the same time. The results showed that AZ61 alloy wear mechanisms included micro-cutting, abrasion, oxidation, delamination, thermal softening and surface melting. When the loaded forces were less than 40 N, the sliding velocity increasing would led the micro-contact points between worn surface interacted time reducing, besides the strain hysteresis, which induced wear rate and coefficient of friction decreasing. When the loaded forces and sliding velocity were increasing, delamination happened and dominated wear rate increasing, gradually. When thermal softening and surface melting appeared, worn surface experienced a very severe alloy transfer process which caused wear rate underwent a dramatic increase. The melting of small amount of eutectics （β-Mg17Al12 phase ＋ α-Mg solid solution phase） in AZ61 led to wear rate curves appear plateaus even valleys in its rising process.

关 键 词：AZ61镁合金 干磨损 磨损率 摩擦系数 磨损图 

分 类 号：TG146.22[一般工业技术—材料科学与工程]